The technical report gives an introduction to number portability and an overview of the current way in which number portability is being implemented in various countries. The objective of the report is to inform the designers of TIPHON equipment and the implementers of TIPHON networks about the requirements they may have to comply with in different countries. The report concentrates on the actual implementations which have been developed rather than the descriptions given in other standardisation documents because; -the standardisation work has been too late to influence many implementations -the objective is to help TIPHON networks fit into existing solutions The report focuses on the technical implementations. National strategies, responsibilities and charging are covered only to the extent necessary to outline the context for the technical solutions. The report gives most emphasis to number portability in fixed networks. The report is complimentary to other deliverables on number portability produced by ETSI.
